The jury has spoken – and it wants San Francisco in 2108 to be a place where forests of towers grow algae as well as house people, and where geothermal steam baths sprout atop Twin Peaks.

Those elements are part of the proposal by IwamotoScott Architecture, selected Sunday as the winner of an eight-team competition to imagine how San Francisco could change during a century likely to be defined by global warming and the search for new forms of energy.

In addition to a $10,000 prize, architects Lisa Iwamoto and Craig Scott received the satisfaction of triumphing over rivals who offered such visions as an offshore island housing 250,000 people and 40-story towers used for commercial farming.